Place pineapple chunks in a large jar or resealable container.
Pour in vodka and store in the refrigerator for 7 days.
Place the sugar and water in a small saucepan and bring to a boil until the sugar has completely dissolved.
Set aside to cool and then refrigerate until ready to use.
Strain the vodka from the pineapple into a clean jar, pressing down on the fruit to extract every bit of juice.
Pour in the syrup and refrigerate for 30 days.